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Astrophysicist warns asteroid strike is not a matter of if, but when

Humans have done a pretty good job of trashing the Earth all by ourselves, but we don’t often stop to consider external threats – like asteroids. A 1908 asteroid explosion over Siberia ravaged 800 square miles, and Queen’s University Belfast astrophysicist Alan Fitzsimmons said another asteroid collision is simply a matter of time. He’s calling for better preparation – since most of us don’t ever think about asteroids as a true threat.